Global warming and climate change is already reshaping coastlines due to higher waters. Pretty soon our next big cities will have to be at sea. But how will they make sustainable food?

Being able to look into the future is a skill that mankind has dreamed about for thousands of years. But seasteading expert Marc Collins believes that the future lies in floating cities where we'll be able to grow meat in laboratories and drink desalinated sea water. It's not that crazy (at all) to believe that once the sea levels rise far enough that humanity will have to either leave the planet or adapt to the new high waters. Marc Collins is the co-founder of Blue Frontiers, a company that aims to design these cities on the sea.